Pub Date : 2024-03-01DOI: 10.15251/jor.2024.202.131
A. A. Abdul Razaq, F. H. Jasim, S. S. Chiad, F. A. Jasim, Z. S. A. Mosa, Y. H. Kadhim
This study uses glass substrates to create nanostructured TiO2 thin films employing SolGel method. Afterwards, TiO2 films are annealed in air for two hours at (400, 450, and 500) °C. The XRD tests demonstrate that all films are tetragonal polycrystalline and have orientations equal to those described in the literature. These findings suggest that when the annealing temperature rises, grain size increases. As the annealing temperature is raised, the Full Width at Half Maximum (FWHM) reduces from 0.57° to 0.0.51°, and the dislocation density drops from 45.22 to 39.22.18 nm, respectively. AFM has examined the thin films' surface morphology. The films formed using this method have good crystalline and homogenous surfaces, according to AFM tests. With an increase in annealing temperature, thin films' average particle size, average roughness, and Root Mean Square (RMS) value all drop. The films' optical characteristics. The transmission was over 97% decreased with increasing annealing temperatures. It is found that the band gap decreases from 3.42 to 3.3 eV with increasing annealing temperature. Between 300 and 900 nm, the films' refractive indices range from 2.89 to 2.2.76. With higher annealing temperatures, the films' extinction coefficients fall.
{"title":"Effect of annealing temperature on the physical of nanostructured TiO2 films prepared by sol-gel method","authors":"A. A. Abdul Razaq, F. H. Jasim, S. S. Chiad, F. A. Jasim, Z. S. A. Mosa, Y. H. Kadhim","doi":"10.15251/jor.2024.202.131","DOIUrl":"https://doi.org/10.15251/jor.2024.202.131","url":null,"abstract":"This study uses glass substrates to create nanostructured TiO2 thin films employing SolGel method. Afterwards, TiO2 films are annealed in air for two hours at (400, 450, and 500) °C. The XRD tests demonstrate that all films are tetragonal polycrystalline and have orientations equal to those described in the literature. These findings suggest that when the annealing temperature rises, grain size increases. As the annealing temperature is raised, the Full Width at Half Maximum (FWHM) reduces from 0.57° to 0.0.51°, and the dislocation density drops from 45.22 to 39.22.18 nm, respectively. AFM has examined the thin films' surface morphology. The films formed using this method have good crystalline and homogenous surfaces, according to AFM tests. With an increase in annealing temperature, thin films' average particle size, average roughness, and Root Mean Square (RMS) value all drop. The films' optical characteristics. The transmission was over 97% decreased with increasing annealing temperatures. It is found that the band gap decreases from 3.42 to 3.3 eV with increasing annealing temperature. Between 300 and 900 nm, the films' refractive indices range from 2.89 to 2.2.76. With higher annealing temperatures, the films' extinction coefficients fall.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"202 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140270888","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-01DOI: 10.15251/jor.2024.202.143
S. Yuvaraj, P. Aji Udhaya, S. Deepa, M. Sundararajan, R. Jothiramalingam, H. Al-Lohedan, H. Al-Sigh, A. A. Nazeer
La2CuO4 perovskite nanoparticles doped with aluminum were synthesized through the microwave-assisted combustion technique. Comprehensive studies on the structural, magnetic optical, functional and morphological properties were conducted using various techniques, including XRD, EDX, VSM, DRS-UV, FT-IR and FESEM respectively, .The XRD patterns of pristine La2CuO4 and Al-doped La2CuO4 unequivocally validated the exclusive development of a perovskite structure, devoid of any impurities. Nevertheless, the augmentation in Al3+ content (x = 0–0.25) induced a noteworthy phase shift from orthorhombic to cubic configuration. The average crystallite dimensions spanned from 54 to 41 nm. Distinct FT-IR bands at approximately 687 and 434 cm-1 were intricately linked to the La-O and Cu-O stretching modes inherent to the orthorhombic La2CuO4 phase. The energy gap determined through the Kubelka–Munk (K–M) methodology, experienced an elevation concomitant with the heightened Al3+ content (1.67–1.72 eV), attributable to quantum confinement phenomena. Within the La2-xAlxCuO4 (x = 0 to 0.25) system, the genesis of nanoscaled crystallized grains, interspersed with pores resulting from the amalgamation of grains, was evident. Analysis of hysteresis curves unveiled the emergence of soft ferromagnetic behavior at ambient temperature.
{"title":"Synthesis and Exploring structural, magnetic, morphology and optical properties of La2−xAlxCuO4 (0 ≤ x ≤ 0.25) perovskite nanoparticles by microwave-assisted combustion method","authors":"S. Yuvaraj, P. Aji Udhaya, S. Deepa, M. Sundararajan, R. Jothiramalingam, H. Al-Lohedan, H. Al-Sigh, A. A. Nazeer","doi":"10.15251/jor.2024.202.143","DOIUrl":"https://doi.org/10.15251/jor.2024.202.143","url":null,"abstract":"La2CuO4 perovskite nanoparticles doped with aluminum were synthesized through the microwave-assisted combustion technique. Comprehensive studies on the structural, magnetic optical, functional and morphological properties were conducted using various techniques, including XRD, EDX, VSM, DRS-UV, FT-IR and FESEM respectively, .The XRD patterns of pristine La2CuO4 and Al-doped La2CuO4 unequivocally validated the exclusive development of a perovskite structure, devoid of any impurities. Nevertheless, the augmentation in Al3+ content (x = 0–0.25) induced a noteworthy phase shift from orthorhombic to cubic configuration. The average crystallite dimensions spanned from 54 to 41 nm. Distinct FT-IR bands at approximately 687 and 434 cm-1 were intricately linked to the La-O and Cu-O stretching modes inherent to the orthorhombic La2CuO4 phase. The energy gap determined through the Kubelka–Munk (K–M) methodology, experienced an elevation concomitant with the heightened Al3+ content (1.67–1.72 eV), attributable to quantum confinement phenomena. Within the La2-xAlxCuO4 (x = 0 to 0.25) system, the genesis of nanoscaled crystallized grains, interspersed with pores resulting from the amalgamation of grains, was evident. Analysis of hysteresis curves unveiled the emergence of soft ferromagnetic behavior at ambient temperature.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"165 ","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140274554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.15251/jor.2024.201.93
A. Modwi, M. A. Aissa, A. Alakhras, H. Idriss
The work reported herein demonstrates the fabrication of CaO nanosheets employing a thermal decomposition method. The obtained CaO nanosheets were characterized using TEM, BET, XRD, EDX, and FTIR instruments. Moreover, the effect of initial dye concentration and pH on MB removal by CaO nanosheets was studied. The result showed that the nanoparticles have sizes around 100 nm, and the CaO nanosheets have an average diameter of 50 nm. Meanwhile, the average pore diameter and surface area of CaO are 15.847 Å and 5.881 m2. g−1 , respectively. Numerical models based on Temkin, Freundlich, and Langmuir were applied to adsorption data to better understand the MB dye adsorption onto CaO nanoparticles. The sorption findings demonstrated a stronger fit with the Temkin model (R2 = 0.983) compared to the Freundlich model (R2 = 0.947) and Langmuir model (R2 = 0.968). The maximum adsorption capacity of MB on the CaO nanoparticles is 688.01 mg/g. The investigation determined that the adsorption kinetics adhered to the Pseudo-second-order kinetic model(R2 =0.982).
本文报告的工作展示了利用热分解法制造氧化钙纳米片的过程。利用 TEM、BET、XRD、EDX 和 FTIR 仪器对获得的 CaO 纳米片进行了表征。此外，还研究了初始染料浓度和 pH 值对 CaO 纳米片去除甲基溴的影响。结果表明，纳米颗粒的尺寸约为 100 nm，而 CaO 纳米片的平均直径为 50 nm。同时，CaO 的平均孔径和表面积分别为 15.847 Å 和 5.881 m2. g-1。为了更好地理解 MB 染料在 CaO 纳米颗粒上的吸附情况，对吸附数据应用了基于 Temkin、Freundlich 和 Langmuir 的数值模型。吸附结果表明，与 Freundlich 模型（R2 = 0.947）和 Langmuir 模型（R2 = 0.968）相比，Temkin 模型（R2 = 0.983）的拟合度更高。MB 在 CaO 纳米粒子上的最大吸附容量为 688.01 mg/g。研究表明，吸附动力学符合伪二阶动力学模型（R2 =0.982）。
{"title":"Adsorption kinetics behavior of MB dye on CaO nanosheets","authors":"A. Modwi, M. A. Aissa, A. Alakhras, H. Idriss","doi":"10.15251/jor.2024.201.93","DOIUrl":"https://doi.org/10.15251/jor.2024.201.93","url":null,"abstract":"The work reported herein demonstrates the fabrication of CaO nanosheets employing a thermal decomposition method. The obtained CaO nanosheets were characterized using TEM, BET, XRD, EDX, and FTIR instruments. Moreover, the effect of initial dye concentration and pH on MB removal by CaO nanosheets was studied. The result showed that the nanoparticles have sizes around 100 nm, and the CaO nanosheets have an average diameter of 50 nm. Meanwhile, the average pore diameter and surface area of CaO are 15.847 Å and 5.881 m2. g−1 , respectively. Numerical models based on Temkin, Freundlich, and Langmuir were applied to adsorption data to better understand the MB dye adsorption onto CaO nanoparticles. The sorption findings demonstrated a stronger fit with the Temkin model (R2 = 0.983) compared to the Freundlich model (R2 = 0.947) and Langmuir model (R2 = 0.968). The maximum adsorption capacity of MB on the CaO nanoparticles is 688.01 mg/g. The investigation determined that the adsorption kinetics adhered to the Pseudo-second-order kinetic model(R2 =0.982).","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"324 5","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139877114","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.15251/jor.2024.201.85
A. V. Balan, P. Gopinath, V. Radhika
XRD and SEM images of ZnO nanoparticles prepared by the precipitation method allow investigation of their morphology and morphological refinement. No contamination was observed in the XRD spectrum and SEM confirmed that the nanoparticles were wellcoordinated ZnO at 30 nm size. UV-Vis spectroscopy was used to tune the optical properties and they appeared not to be fixed at 3.34 eV. The band gap of semiconductor materials makes them competitive for solar cell applications. The O-rich stoichiometry measured by XPS may be a direct result of zinc deficiency. Therefore, ZnO nanoparticles were prepared to fabricate secretory solar cells (DSSCs). From the perspective of J-V, open circuit voltage (Voc), barrier thickness (Jsc), fill factor (FF) and efficiency (η) were not chosen as much as possible and the quality was calculated as 0.65V, 6.26mA. , 62.2% and 1.96% respectively at 100mW/cm2 .
{"title":"Enhanced photovoltaic performance of dye sensitized solar cell based on nanocomposites of zinc oxide photoanode","authors":"A. V. Balan, P. Gopinath, V. Radhika","doi":"10.15251/jor.2024.201.85","DOIUrl":"https://doi.org/10.15251/jor.2024.201.85","url":null,"abstract":"XRD and SEM images of ZnO nanoparticles prepared by the precipitation method allow investigation of their morphology and morphological refinement. No contamination was observed in the XRD spectrum and SEM confirmed that the nanoparticles were wellcoordinated ZnO at 30 nm size. UV-Vis spectroscopy was used to tune the optical properties and they appeared not to be fixed at 3.34 eV. The band gap of semiconductor materials makes them competitive for solar cell applications. The O-rich stoichiometry measured by XPS may be a direct result of zinc deficiency. Therefore, ZnO nanoparticles were prepared to fabricate secretory solar cells (DSSCs). From the perspective of J-V, open circuit voltage (Voc), barrier thickness (Jsc), fill factor (FF) and efficiency (η) were not chosen as much as possible and the quality was calculated as 0.65V, 6.26mA. , 62.2% and 1.96% respectively at 100mW/cm2 .","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"8 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139887467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.15251/jor.2024.201.93
A. Modwi, M. A. Aissa, A. Alakhras, H. Idriss
The work reported herein demonstrates the fabrication of CaO nanosheets employing a thermal decomposition method. The obtained CaO nanosheets were characterized using TEM, BET, XRD, EDX, and FTIR instruments. Moreover, the effect of initial dye concentration and pH on MB removal by CaO nanosheets was studied. The result showed that the nanoparticles have sizes around 100 nm, and the CaO nanosheets have an average diameter of 50 nm. Meanwhile, the average pore diameter and surface area of CaO are 15.847 Å and 5.881 m2. g−1 , respectively. Numerical models based on Temkin, Freundlich, and Langmuir were applied to adsorption data to better understand the MB dye adsorption onto CaO nanoparticles. The sorption findings demonstrated a stronger fit with the Temkin model (R2 = 0.983) compared to the Freundlich model (R2 = 0.947) and Langmuir model (R2 = 0.968). The maximum adsorption capacity of MB on the CaO nanoparticles is 688.01 mg/g. The investigation determined that the adsorption kinetics adhered to the Pseudo-second-order kinetic model(R2 =0.982).
本文报告的工作展示了利用热分解法制造氧化钙纳米片的过程。利用 TEM、BET、XRD、EDX 和 FTIR 仪器对获得的 CaO 纳米片进行了表征。此外，还研究了初始染料浓度和 pH 值对 CaO 纳米片去除甲基溴的影响。结果表明，纳米颗粒的尺寸约为 100 nm，而 CaO 纳米片的平均直径为 50 nm。同时，CaO 的平均孔径和表面积分别为 15.847 Å 和 5.881 m2. g-1。为了更好地理解 MB 染料在 CaO 纳米颗粒上的吸附情况，对吸附数据应用了基于 Temkin、Freundlich 和 Langmuir 的数值模型。吸附结果表明，与 Freundlich 模型（R2 = 0.947）和 Langmuir 模型（R2 = 0.968）相比，Temkin 模型（R2 = 0.983）的拟合度更高。MB 在 CaO 纳米粒子上的最大吸附容量为 688.01 mg/g。研究表明，吸附动力学符合伪二阶动力学模型（R2 =0.982）。
{"title":"Adsorption kinetics behavior of MB dye on CaO nanosheets","authors":"A. Modwi, M. A. Aissa, A. Alakhras, H. Idriss","doi":"10.15251/jor.2024.201.93","DOIUrl":"https://doi.org/10.15251/jor.2024.201.93","url":null,"abstract":"The work reported herein demonstrates the fabrication of CaO nanosheets employing a thermal decomposition method. The obtained CaO nanosheets were characterized using TEM, BET, XRD, EDX, and FTIR instruments. Moreover, the effect of initial dye concentration and pH on MB removal by CaO nanosheets was studied. The result showed that the nanoparticles have sizes around 100 nm, and the CaO nanosheets have an average diameter of 50 nm. Meanwhile, the average pore diameter and surface area of CaO are 15.847 Å and 5.881 m2. g−1 , respectively. Numerical models based on Temkin, Freundlich, and Langmuir were applied to adsorption data to better understand the MB dye adsorption onto CaO nanoparticles. The sorption findings demonstrated a stronger fit with the Temkin model (R2 = 0.983) compared to the Freundlich model (R2 = 0.947) and Langmuir model (R2 = 0.968). The maximum adsorption capacity of MB on the CaO nanoparticles is 688.01 mg/g. The investigation determined that the adsorption kinetics adhered to the Pseudo-second-order kinetic model(R2 =0.982).","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"19 3","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139817129","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.15251/jor.2024.201.103
V. Balasubramanian, R. Jeyachitra, T. S. Senthil, S. Kalpana
The key goal of this study is to innovate the pure and 0.05, 0.10 and 0.15 wt.% of Cudoped ZnO NPs through co-precipitation technique. PXRD pattern shows the hexagonal crystal structure with no any phase impurity were observed for all the synthesized samples. From UV-Vis DRS spectra, band gap was obtained as 3.18, 3.24, 3.29 and 3.33 eV respectively for undoped, Cu-doped ZnO NPs (0.05, 0.10 and 0.15 wt.%). From SEM analysis, the agglomeration of rod-like morphology for pure ZnO NPs, spherical-like morphology for Cu-doped ZnO NPs (0.05 wt.%) and flake-like morphology for Cu-doped ZnO NPs (0.10 wt.%) and flower-like morphology for Cu-doped ZnO NPs (0.15 wt.%). The photocatalytic performance of the synthesized NPs was studied by the dye degradation of Methylene Blue (MB) under UV irradiation. The result exposed that, 0.15 wt.% of Cu-doped ZnO NPs is found to have efficient degradation candidate materials.
{"title":"Enhanced photocatalytic degradation of pure and Cu-doped ZnO nanoparticles prepared under Co-precipitation method","authors":"V. Balasubramanian, R. Jeyachitra, T. S. Senthil, S. Kalpana","doi":"10.15251/jor.2024.201.103","DOIUrl":"https://doi.org/10.15251/jor.2024.201.103","url":null,"abstract":"The key goal of this study is to innovate the pure and 0.05, 0.10 and 0.15 wt.% of Cudoped ZnO NPs through co-precipitation technique. PXRD pattern shows the hexagonal crystal structure with no any phase impurity were observed for all the synthesized samples. From UV-Vis DRS spectra, band gap was obtained as 3.18, 3.24, 3.29 and 3.33 eV respectively for undoped, Cu-doped ZnO NPs (0.05, 0.10 and 0.15 wt.%). From SEM analysis, the agglomeration of rod-like morphology for pure ZnO NPs, spherical-like morphology for Cu-doped ZnO NPs (0.05 wt.%) and flake-like morphology for Cu-doped ZnO NPs (0.10 wt.%) and flower-like morphology for Cu-doped ZnO NPs (0.15 wt.%). The photocatalytic performance of the synthesized NPs was studied by the dye degradation of Methylene Blue (MB) under UV irradiation. The result exposed that, 0.15 wt.% of Cu-doped ZnO NPs is found to have efficient degradation candidate materials.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"84 2","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139877041","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.15251/jor.2024.201.85
A. V. Balan, P. Gopinath, V. Radhika
XRD and SEM images of ZnO nanoparticles prepared by the precipitation method allow investigation of their morphology and morphological refinement. No contamination was observed in the XRD spectrum and SEM confirmed that the nanoparticles were wellcoordinated ZnO at 30 nm size. UV-Vis spectroscopy was used to tune the optical properties and they appeared not to be fixed at 3.34 eV. The band gap of semiconductor materials makes them competitive for solar cell applications. The O-rich stoichiometry measured by XPS may be a direct result of zinc deficiency. Therefore, ZnO nanoparticles were prepared to fabricate secretory solar cells (DSSCs). From the perspective of J-V, open circuit voltage (Voc), barrier thickness (Jsc), fill factor (FF) and efficiency (η) were not chosen as much as possible and the quality was calculated as 0.65V, 6.26mA. , 62.2% and 1.96% respectively at 100mW/cm2 .
{"title":"Enhanced photovoltaic performance of dye sensitized solar cell based on nanocomposites of zinc oxide photoanode","authors":"A. V. Balan, P. Gopinath, V. Radhika","doi":"10.15251/jor.2024.201.85","DOIUrl":"https://doi.org/10.15251/jor.2024.201.85","url":null,"abstract":"XRD and SEM images of ZnO nanoparticles prepared by the precipitation method allow investigation of their morphology and morphological refinement. No contamination was observed in the XRD spectrum and SEM confirmed that the nanoparticles were wellcoordinated ZnO at 30 nm size. UV-Vis spectroscopy was used to tune the optical properties and they appeared not to be fixed at 3.34 eV. The band gap of semiconductor materials makes them competitive for solar cell applications. The O-rich stoichiometry measured by XPS may be a direct result of zinc deficiency. Therefore, ZnO nanoparticles were prepared to fabricate secretory solar cells (DSSCs). From the perspective of J-V, open circuit voltage (Voc), barrier thickness (Jsc), fill factor (FF) and efficiency (η) were not chosen as much as possible and the quality was calculated as 0.65V, 6.26mA. , 62.2% and 1.96% respectively at 100mW/cm2 .","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"26 6","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139827647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.15251/jor.2023.196.643
T.V. Kumar, K. P. Kumar, G. Prathibha, N.H Kumar, B. H. C. Rao
Na+ ion-conducting solid electrolyte of sodium nitrate (NaNO3) and Sr(NO3)2 mixed crystals were grown by slow evaporation technique. XRD, FTIR, SEM characterizations and AC, DC conductivities were carried out on the pellets. Conductivity in these mixed solid electrolytes was noticed to increase with increase in m/o Sr(NO3)2 upto 14.68 followed by decrease. The conductivity in 14.68 m/o Sr(NO3)2 is more than one order of magnitude as compared to NaNO3 in the extrinsic region. Ionic transport in these mixed systems is explained.
{"title":"Ionic transport study in [NaNO3]100-x:[Sr(NO3)2]x mixed solid electrolyte system","authors":"T.V. Kumar, K. P. Kumar, G. Prathibha, N.H Kumar, B. H. C. Rao","doi":"10.15251/jor.2023.196.643","DOIUrl":"https://doi.org/10.15251/jor.2023.196.643","url":null,"abstract":"Na+ ion-conducting solid electrolyte of sodium nitrate (NaNO3) and Sr(NO3)2 mixed crystals were grown by slow evaporation technique. XRD, FTIR, SEM characterizations and AC, DC conductivities were carried out on the pellets. Conductivity in these mixed solid electrolytes was noticed to increase with increase in m/o Sr(NO3)2 upto 14.68 followed by decrease. The conductivity in 14.68 m/o Sr(NO3)2 is more than one order of magnitude as compared to NaNO3 in the extrinsic region. Ionic transport in these mixed systems is explained.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"33 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139303288","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.15251/jor.2023.196.631
H. H. Madani, M. R. Shayesteh, M. R. Moslemi
In this paper, a new structure of SiGe thin film solar cell using a carbon nanotubes (CNT) grating layer is proposed. CNT grating layer is used which reduces the reflection loss from the surface and maximizing optical absorption in the active layer of the cell. In order to reduce the carrier recombination in the back contact, a GaAs back-surface field (BSF) layer was used. The simulation results show that the efficiency of the proposed structure is 29.32%. Furthermore, we were able to increase the efficiency to 31.3% by optimizing the structural parameters including the depth and number of grating periods.
{"title":"Efficiency enhancement in SiGe thin film solar cell by a CNT grating structure","authors":"H. H. Madani, M. R. Shayesteh, M. R. Moslemi","doi":"10.15251/jor.2023.196.631","DOIUrl":"https://doi.org/10.15251/jor.2023.196.631","url":null,"abstract":"In this paper, a new structure of SiGe thin film solar cell using a carbon nanotubes (CNT) grating layer is proposed. CNT grating layer is used which reduces the reflection loss from the surface and maximizing optical absorption in the active layer of the cell. In order to reduce the carrier recombination in the back contact, a GaAs back-surface field (BSF) layer was used. The simulation results show that the efficiency of the proposed structure is 29.32%. Furthermore, we were able to increase the efficiency to 31.3% by optimizing the structural parameters including the depth and number of grating periods.","PeriodicalId":54394,"journal":{"name":"Journal of Ovonic Research","volume":"40 1","pages":""},"PeriodicalIF":1.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139304954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-01DOI: 10.15251/jor.2023.196.673
A. Neelaveni, N. Sivakumar
In this work, we manufacture NaVOPO4 with the addition of one additional Na ion to enhance the stability and electrochemical formulation utilizing three ways, including sol gel-assisted hydrothermal, pure sol-gel, and solid state reaction methods. The sol-gel aided hydrothermal approach is the most effective way to add more Na ions to the NaVOPO4 matrix out of the three. Due to the presence of carbon content in high temperatures, the alterations of oxygen environment (O (1 &2) sites around the Na and V cause NaVOPO4/ Na2V(PO4)2 (NVP). The traces with high intensity at 17.99o indicates the tetragonal phase of Na2V(PO4)2 in NaVOPO4 and it is concreted by Raman analysis by peak shifting from 884 to 866 cm–1 . The character in Na2V(PO4)2 influences the Na ion intercalation process and yields the specific capacity in a three-electrode system is 0.83mAh/g at the scan rate of 10mV/s.
在这项工作中，我们利用溶胶凝胶辅助水热法、纯溶胶凝胶法和固态反应法等三种方法，在制造 NaVOPO4 时添加了一个额外的 Na 离子，以增强其稳定性和电化学配方。在这三种方法中，溶胶凝胶辅助水热法是在 NaVOPO4 基体中添加更多 Na 离子的最有效方法。由于高温下碳含量的存在，Na 和 V 周围的氧环境（O (1 & 2) 位点）发生了变化，导致 NaVOPO4/ Na2V(PO4)2 (NVP)。17.99o 处的高强度迹线表明 NaVOPO4 中的 Na2V(PO4)2 为四方相，拉曼分析通过峰值从 884 cm-1 移动到 866 cm-1 证实了这一点。Na2V(PO4)2 中的特性影响了 Na 离子的插层过程，在扫描速率为 10mV/s 的三电极系统中产生的比容量为 0.83mAh/g。
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